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Check engine light

Tiny
BALDAUSKI
  • MEMBER
  • 2001 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 32,000 MILES
The check engine light comes on intemittantly. We have had it serviced by a dealer several times with no results. They have replaced the gas cap, replaced a leaky fitting on the fuel tank, and replaced a section of a line between the fuel tank and engine. This all after having pressurized the fuel tank with smoke. After each repair the check engine light is off for a few days and then comes back on. The car is used for around town driving only and not every day. It sits in the driveway rather than a gargage, year around since new.
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Monday, June 15th, 2009 AT 10:06 AM

31 Replies

Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
Ok if you would call around to your local parts stores and see if one does a free scan. If so get it scanned and get the codes and then have them clear the codes. Get back to me with what codes have been found.
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Monday, June 15th, 2009 AT 1:36 PM
Tiny
ROBERTBOCHROCH
  • MEMBER
  • 1 POST
  • 2001 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 119,550 MILES
On my way home this evening I had to accelerate hard to get out of the way of a fast moving car coming from behind. The revs went high, but just for a couple of seconds and the check engine light came on and stayed on.I'm taking it for service in the morning. It seems to be running fine but I'm still worried, I just bought it a month ago. Thank you.
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Saturday, November 23rd, 2019 AT 2:08 PM (Merged)
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
First of all thank you so much for your donation.I would need the code number's your car has to tell you more. If you get them to me I would be more then happy to explain them to you.
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Saturday, November 23rd, 2019 AT 2:08 PM (Merged)
Tiny
DEPUTYSAJ
  • MEMBER
  • 3 POSTS
  • 2001 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 112,000 MILES
Lately I have had the smell of raw gas when I start my Jeep and now the check engine light is on. The smell goes away shortly after the vehicle is started. I have checked the gas cap to make sure it is seated properly. Can you give a few ideas of what may be causing this?
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Saturday, November 23rd, 2019 AT 2:08 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,128 POSTS
Hi:
To start, check the fuel tank and fuel lines under the vehicle to look for leaks or evidence of leaks. If there are none, do the same under the hood. Look for leaks near the injectors, fuel rail, fuel line. If every thing looks good, I want you to take the vehicle to a nationally recognized auto parts store like Advance or Auto Zone. Usually at no charge, they will scan the computer for trouble codes. By doing this, we will know if a sensor is causing the problem and which one it is.

Let me know what you find.

Joe

Also, regardless if you find a leak or not, have the computer scanned and reset.
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Saturday, November 23rd, 2019 AT 2:08 PM (Merged)
Tiny
DEPUTYSAJ
  • MEMBER
  • 3 POSTS
Autozone says it's a large vacuum leak. Most likely a faulty gas cap. So that is where I will start. Thanks for the info. I will reply back if thats not it.
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Saturday, November 23rd, 2019 AT 2:08 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,128 POSTS
Hi,

Okay, they found a EVAP fault code. The gas cap is the easiest thing to try first. If the light comes on again, go to the EVAP canister and check for cracks, broken vacuum hoses, or disconnect vac hoses. If there is no luck there, check for vacuum leaks on the engine itself. If that fails, you may have a defective vent / purge solenoid.

We will cross that road when we reach it. I hope the gas cap fixes it.

Let me know if you have any other questions or need help.

Joe
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Saturday, November 23rd, 2019 AT 2:08 PM (Merged)
Tiny
DEPUTYSAJ
  • MEMBER
  • 3 POSTS
Looks like so far it was the gas cap. I replaced the factory cap with a locking one when gas prices started hitting $4 a gallon. I put the old cap back on and knock on wood it's been 4 days and no problems. Thanks for all your help.
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Saturday, November 23rd, 2019 AT 2:08 PM (Merged)
Tiny
KIMPABLO
  • MEMBER
  • 1 POST
  • 2001 JEEP CHEROKEE
Computer problem 6 cyl Four Wheel Drive Automatic

my dad put gas in it and all of a sudden it started cutting off while driving and my check engine light came on I thought bad gas so I put gas treatment in and it was fine light went off. Now its back on and doing the same so I had the light checked and they said that there could be 10 diffrent problems any advice?
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Saturday, November 23rd, 2019 AT 2:08 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,128 POSTS
Hi:
That is good news. I hope it continues to work.

Joe
Positive feedback and votes are appreciated.
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Saturday, November 23rd, 2019 AT 2:08 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Make sure the gas cap is properly tightened light continues scan the computer to see what code it is?

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

My guess is probably within the evaporation control system after the filled-up. Like a bad gas cap.
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Saturday, November 23rd, 2019 AT 2:08 PM (Merged)
Tiny
LIMADUDE
  • MEMBER
  • 6 POSTS
You hit it on the money new gas cap all fixed thanks!
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Saturday, November 23rd, 2019 AT 2:08 PM (Merged)
Tiny
XTESTPILOT
  • MEMBER
  • 2 POSTS
  • 2001 JEEP CHEROKEE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
My dealer is unable to fix the problem on a permanent basis. The check engine light will come on, the engine sputters around 80km with a distinct power loss and knock. At the same time, the cruise control also goes out. If left in this state, the engine will also stutter and knock with the power loss at 100km and the power loss will continue to worsen.
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Saturday, November 23rd, 2019 AT 2:08 PM (Merged)
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
First thing you need is the fualt code, do this.
With the ignition switch in the OFF position, depress the TRIP and RESET buttons.
While holding the TRIP and RESET button turn the ignition switch to the ON position.
Continue to hold the TRIP and RESET buttons until the word CODE appears in the odometer windows (about five seconds ) then release the buttons. If a problem exists, the system will display Diagnostic Trouble Codes (DTC's). If no problem exists, the code 999 (End Test) will momentarily appear. Post all codes displayed.
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Saturday, November 23rd, 2019 AT 2:08 PM (Merged)
Tiny
XTESTPILOT
  • MEMBER
  • 2 POSTS
Hi, I only have a trip/reset button. I pressed and held it as advised - the instrument cluster went through a check showing all the lights at various times and the guages all going trough a number of positions. The odometer showed all 1's through all 9's, then showed the trip setting. Pretty neat. The word Codes never showed up and at the end of the dash test, the engine check light came on again.
I read a number of stuttering, power loss problems for Jeeps and it seems the fuel pump may be the problem.
Any thoughts? Thanks.
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Saturday, November 23rd, 2019 AT 2:08 PM (Merged)
Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,542 POSTS
  • 2001 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 92,000 MILES
2001 Jeep Cherokee mileage: 92,000. My check engine light comes on and the trouble codes say its problem #25 - idle air control sensor circuit. The dealer and auto parts stores say there is no idle air control on my vehicle. Then what is trouble code 25? In addition, in the morning when it is cold I can start it fine but it will not stay running unless I hold down the accelerator. It acts like an old car, but once it is warmed up its okay. Please help, thank you.
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Saturday, November 23rd, 2019 AT 2:08 PM (Merged)
Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,542 POSTS
The symptoms you describe are classic idle air control motor failure. As far as we know, your car should be equipped with an idle air control motor.
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Saturday, November 23rd, 2019 AT 2:08 PM (Merged)
Tiny
DPENA18
  • MEMBER
  • 1 POST
  • 2001 JEEP CHEROKEE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 125,000 MILES
I bought my Jeep at 56,000 miles and within 3 weeks of purchase the engine light came on, stayed on for 1 week and then turned off. It continued this "on for a while, off for a while cycle" for several months. I diagnosed the error codes as O2 sensor issues, and have replaced both sensors. I have also changed all the plugs, and cables. The engine light is now on all the time. I can reset the light, it stays off for a day or two, and then comes on again. Any suggestions?
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Saturday, November 23rd, 2019 AT 2:08 PM (Merged)
Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
Need to get the codes
if you have no access to an OBDII reader
you can cycle key ON OFF ON OFF ON
read p codes in the odometer area

let me know what you have for codes
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Saturday, November 23rd, 2019 AT 2:08 PM (Merged)
Tiny
BARBANDTHURMAN
  • MEMBER
  • 1 POST
  • 2001 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 10,700 MILES
I recently bought this vehicle. It did not have the owners manual in the glove box so when the check engine light came on I don't know if it would indicate electrical, exhaust, etc. Or what kind of problem. Any suggestions?
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Saturday, November 23rd, 2019 AT 2:08 PM (Merged)

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